Optical measurement of the difference in alignment between refer

Details Optical measurement of the difference in alignment between refer Optical measurement of the difference in alignment between refer

1975-05-23

1976-11-09

Wilbur, Maynard R.

Optics: measuring and testing

Angle measuring or angular axial alignment

With photodetection remote from measured angle

89 181, 356150, 356172, G01B 1126

Patent

active

039907961

ABSTRACT:
A means for the measurement of the alignment error between a plurality of ordinate reference frames and a relatively absolute reference frame determines all three degrees of freedom utilizing a single beam of light with relatively narrow angular extent. The measurement means has a light source, collimator, a plurality of reflecting folding mirrors and a pair of retroreflectors rigidly fixed to each coordinate reference frame. As the collimated light beam strikes a folding mirror it is reflected toward the corresponding coordinate reference frame where it is reflected back by the retroreflectors. The angles of tilt, twist and rotation at which it is reflected are representative of the misalignment of the coordinate reference frame. The folding mirror then reflects the retroreflected beam back toward the source, where the beams are detected. Means are provided for moving the folding mirrors out of and into the path of the issuing light beam, so that the beam may strike any of the folding mirrors and be reflected toward the corresponding coordinate reference frame. A porro reflector may also be associated with each folding mirror, enabling the measurement of the deviation of any of the folding mirrors.

REFERENCES:
patent: 3326076 (1967-06-01), Burg
patent: 3612694 (1971-10-01), Mottier et al.
patent: 3709608 (1973-01-01), Degan et al.

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